B0
T1 T2
B0
90o
M0
Mz (a)
90o Mz
(b) Mxy
(c) Mz
Mxy
T1 T2
Gss
GP E GF E
3rd
(a)
GF E GP E
(b) GF E
Kf e b d (c)
GP E (e)
3rd
(a) T1 (b) T2
G(x)
(a) (b)
488 Hz/pixel 3 T
B0
B0 B0 (a)
(b)
21
3 T mm
122 Hz/mm
1st 2nd
0th B0
≥ 0.9 122 Hz/mm
(a) (b)
1 Gy
(a) (b) (c)
(d) (e)
(f )
3 T mean± 3StD
(a) (b)
(c)
(d) (e) (f ) Std
σ 4− mm
3 T
B0
< 1.0% < 0.5%
488 Hz/pixel 488 Hz/mm
1 mm
> 2 mm 15.4% 2.0%
B0
B0
1%
B0
19 21
< 1.0% < 0.5%
488 Hz/pixel 488 Hz/mm 1 mm
> 2 mm 15, 4% 2, 0%
B0
B0
B0
3D
1 5 1 6
75 31.6% 28.7%
50%
3D
B0 B0
B0 B0 3 T
1.5 ppm 50 cm
B1
ω0 = γB0
γ 42.58 M Hz/T
B0
1.5T 63.86 M Hz 127.71 M Hz 3 T
Mz Mxy
Mz z
M0 M0
B0 nT
3 T
90o
90o
M0 Mz (a)
90o Mz (b)
Mxy (c)
Mz Mxy
T1 T2
T1 T2
T1
T2
T1
T1
T1
63%
90o T1
90o
Mz(t) = M0(1− e−t/T1) T1 t 63%
T1
T2
T2 T2
37% T1
T2 90o
Mxy(t) = Mxy(0)e−t/T2
T2∗ T2
Gss GF E
GP E
Gss
GP E GF E
3rd
GSS x y z
GSS GP E
GF E
180o
(a) GF E
GP E (b) GF E
Kf e b d (c) GP E
(e)
3rd
T1 T2
T1 T2 T1 T2
1 s
10 ms 5 s 100 ms
T1
T2
T1 T2
(a) T1 (b) T2
320
2%
2%
1.6%
0.3%
2%
B0
1 mm 2 mm
2 mm
x
y z 3D
x# = x + ∆x
= x + δBGx(x, y, z) Gx
+ δB0(x, y, z) Gx
+ δBs(x, y, z) Gx
y# = y + ∆y
= y + δBGy(x, y, z) Gy
z# = z + ∆z
= z + δBGz(x, y, z) Gz
∆x ∆y ∆z
Gx Gy Gz δBGx δBGy δBGy δB0 δBs
3D B0
2D B0
B0
B0
B0
10− 25 Hz 139 Hz
B0
B0
B0
B0 B0
1.5 ppm
B0
(x, y, z) ∆B0
∆x = δB0(x, y, z) GR
GR GR = BW
γF OV
γ 42.58 M Hz/T
B0
3D
X0 X1
G(x)
100
438.7 × 346.0 × 470.0 mm3 1177 17 mm
< 0.5 mm
3 T
3D
3D 200− 250 mm 44.64 mm 9.59 mm
200 mm 40 mm 30 mm
(a) (b)
488 Hz/pixel 3 T
3 T
2.6 mm 7.5 mm
2.75 mm 3.70 mm
122 Hz/pixel 244 Hz/pixel 488 Hz/pixel 122 Hz/mm 488 Hz/mm
36%
250 mm
B0
B0
3 T
B0
122 Hz/pixel 244 Hz/pixel 488 Hz/pixel 122 Hz/mm 488 Hz/mm
3 T 122 Hz/pixel 244 Hz/pixel 488 Hz/pixel 5.8 mm 2.9 mm 1.5 mm
2.39 mm 3 T
5 mT /m
> 2 mm
15.4% 0.0% 122 Hz/mm 488 Hz/mm 3 T
180 Hz/pixel 0.1%
> 2 mm
0.5 T 0.5 T
0.57 mm 0.73 mm
0.9 mm 2.6 mm 0.5 T 1.5 T
B0
B0
B0 B0 B0
B0
B0 B0
B0
B0 B0 (a) (b)
B0
> 2 mm 15.4%
2.0%
> 2 mm 11.5%
32.5% 56%
21
3 T mm
122 Hz/mm
1st 2nd
0th B0
(max :≈ 3 mm
(max :≈ 1 mm) 122 Hz/pixel
488 Hz/pixel
2.9 mm 0.9 mm 122 Hz/mm 488 Hz/mm
0 1
122 Hz/mm 488 Hz/mm
0.85 ±
0.06 122 Hz/mm 0.97 ± 0.01
488 Hz/mm 0.938
≥ 0.9 122 Hz/mm
(a) (b)
3 T
≈ 220 Hz 1.5 T ≈ 440 Hz 3 T
488 Hz/pixel
1 mm
B0
3% 2−4 mm
17 21
< 1.0% (max : 0.38%± 0.59%)
D50 <
0.5% (max : 0.11% ± 0.2%
1 Gy
27
±0.5%
4.4 mm 23 27
< 1 mm 3D 0.01% (1.1 cGY )
11.9 mm 7.9 mm 1 T 3 T
18
0.02%±0.25% (1 SD) 3D
< 1.0% (max : 0.38% ± 0.59%)
< 0.5% (max : 0.11%± 0.2%
3%
66%
42% 18
16 45%
19.0 cm± 0.2 cm B0
(d) 1 mm
B0
(c) 5.0 mm ±
0.7 mm
(d) 5 mm
B0
1 cm2
(e)
(e)
≤ 2.5%
10 3 4 (f )
3 T 37
(a) (b)
(c) (d)
(e) (f )
SN R = mean σ
mean σ 80%
(e)
22 1.5 T 3 T
mean ± 3σ 3 T
cm 18.99± 0.19 19± 0.2 mm 3.26± 2.69 ±5
mm 5.57± 0.71 5± 0.7
% 97.61± 2.97 ≥ 82
% 0.43± 0.18 < 2.5 3 T
4
mean ± 3σ(3StD) 3 T
2.5% 19± 0.2 cm
3 T mean±3StD
(a) (b)
(c) (d) (e) (f ) Std
σ
B0
4 mm
4− mm
5s
6.6% B0 B0
100% 83.3%
19 cm
60 cm
83.3%
33.3%
4 18
100
3 T
3 T
3 T
122 Hz/pixel, 244 Hz/pixel 488 Hz/pixel 17
3.19 mm
25 cm 5.8 mm
122 Hz/pixel 0.5%
90%
(−0.5, 0.5)
3D 0.5%
21
122 Hz/mm 488 Hz/mm 3 T
2 mm 15.4% 2.0%
2 mm 11.5% 32.3%
3D
200 mm 2.17 mm
2 mm
15.4% 0.0% 122 Hz/mm 488 Hz/mm
D50 0.4±0.6% 0.3±0.5% 122 Hz/mm 488 Hz/mm
B0
B0
B0
B0
B0 B0
B0
B0
mean± 3σ 1%
2D 3D
B0
B0 B0
B0
B0 B0
B0